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优质非合金钢
met.
unalloyed quality steel
;
high quality unalloyed steel
(【技】除普通质量非合金钢和特殊质量非合金钢以外的非合金钢。这种钢在生产过程中需要特别控制晶粒度,降低硫、磷含量,改善表面质量,增加工艺控制。)
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